So far there are five families in Deltarune: The Dreemurrs, The Holidays, The Cattenheimers, The Booms, and Dad Gang. This raises so many questions like, do Susie, Berdly, Jockington, Undyne, Napstablook, Alphys and others have families? Sans and Papyrus are known to be brothers but their family name is unknown (it's assumed 'Gaster' as their family name).